A purposive sample of surgeons and clinicians at expert centres will receive questionnaires to explore views to endotherapy and surgery for the treatment of Barrett's oesophagus with HGD or early cancer and on the proposed trials (including 'free text' options inviting views on randomization to a trial comparing surgery to endoscopic treatment). Questionnaires will be distributed to up to 100 oesophagogastric surgeons and clinicians (lead MDT gastroenterologists or expert endoscopists) from the participating centres and other centres in the UK as advised by our surgical lead. The questionnaires will be administered by e mail. A second e mail will follow after a month in the case of non-response, but those who chose not to respond thereafter will not be further contacted.